This jeep flipped over and hit a family of four during a terrible accident in Brooklyn sparked by a speeding SUV. Photo: Benny J. Stumbo

An out-of-control SUV driver blew a stop sign and caused a domino effect of destruction — hitting a jeep that flipped over and struck a group of pedestrians in Brooklyn this afternoon, witnesses and authorities said.

Horrified onlookers watched as Jeep hit a family of four standing on a sidewalk, leaving one member clinging to life, witnesses and authorities said.

At least four others were injured in the massive accident.

“My mother and I heard screaming and a huge explosion coming from [the street.] I immediately thought my brother could be out there,” said Diana Babbo, 18.

“I ran up the street and saw that a Jeep was flipped over. An entire family was pinned between the jeep and a parked car on the street, she said.

“A lady was completely dead or passed out. It was horrifying. An infant and two other people were under the car. It was so terrible. I’m trembling thinking about it.”

Babbo bawled as they pulled the car off the woman, she said.

“She was turning blue,” the teen recalled.

“The guy driving the Jeep had his head cracked open. He was walking towards the police after they cut him out of his car.”

The man passed out on the street, she said.

“I pray to god everybody is okay. I can’t get their faces out of my head.”

Other residents like Mohammed Umair, 17, said accidents have happened at this location many times before.

“This cross street is a death trap,” he said.

“A car smashed into a house. This isn’t going to stop until there are more lights and signs put up. More people are going to die if something isn’t done.”